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Currently, each content process re-derives the path(s) of the omnijar file(s). We used to pass it down as a command-line argument, but those args were also accepted by the parent process and there were issues with that (CVE-2020-6799) such that they were completely removed (bug 1531475). However, content processes can generally trust their arguments; note that they currently accept `-appDir`. We were already using `-gredir` for this on Android (it has a unified omnijar, so there's no `-appdir` in that case); this patch subsumes the content-process case of that, but not the parent process (which consumes basically a fake argv constructed in Java code). Note that only the parent process and content processes use the omnijars; every other process type uses either minimal XPCOM, which doesn't include them, or no XPCOM at all (e.g., GMP before bug 1845946). The end goal of this patch series is to use those flags with the fork server (so that it can preload the files without needing any XPCOM), but this patch changes only the case of content processes. Differential Revision: https://phabricator.services.mozilla.com/D182510